from The Century Dictionary and Cyclopedia
- n. A rare silicate containing chiefly titanium and the metals of the cerium group, occurring in reddish-brown prismatic crystals, and also in massive and fibrous forms. It is found in the elæolite-syenite of southern Norway.
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( "REO")), followed by a zone dominated by mosandrite and yttrio-titanite (up to 65% REO) and lastly by a calc-alkaline zone dominated by britholite (up to 62% REO).